How to set pageParam to undefined using Architect?

Working with Ext.data.proxy.Ajax, we'd like to disable the 'page' URL parameter. According to the docs we need to set pageParam to undefined, but we can't figure out how to accomplish this using Architect. Entering the word undefined in the value field of the configuration panel results in the pageParam being set to a quoted string 'undefined'.

I understand we could just fire up and editor and directly change the .js file, but that gets overwritten by all subsequent save operations from within Architect.